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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01b2c18a98ef1b670e741a6bf5feec593403d6e93fb1b8d8992d84c1eacef42' 
  AND token = 'Pct+WcqcoSLGaDRNDDIPweNWvhm2m+1if7n4eKQVh9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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