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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840090d8fa71ea233b0ed79cdc1e66bc14ada39f2f1d7763af62754cca96f136' 
  AND token = 'r5Yr5TENIwLR5AFZvetEM1Q3/s9g0VakdreycI0IU2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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