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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713d97bb76930527415d8b5256797611524556eb1d9b36ad3c534c3b3a893947' 
  AND token = 'T6e1FSO5iv23ZYelH4tVKm3/dWues3oMoykz8+xGqO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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