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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fa7aff6d9ceedac386b290d56a2b45dc0e5bc6fe5e9ba8921165485fd30a6e' 
  AND token = 'W7itpeIvztxPUJhE3m1GanRkN+ay5hnHl9MSyInqeDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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