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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde70fd9502c4a41f49db99f06f0439c9ffaed1e0c6204bc1752e989b6802888' 
  AND token = 'F4AigQWkhF1BvY4V6cqyX/yPphvH/ciOP0PstuaPYdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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