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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa91fd439b1967e51aa7194b10c6e56049bd84dfabcb4d9cd198df817f6fcbe' 
  AND token = 'Bx4Ne2gF5xt6h64iaPL6KxrKtT6tGyQbv4NBXhO58wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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