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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd352ab95c96c06c86f04ae67233ca0569369605818924ea4ec6541e504b8cf' 
  AND token = 'U7pD483jlQbOsl/YcNgiy+QWgDuD1ntdp754AbCOYUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}