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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada1b8e6cf8dee9b37dc9950f7e79e77ba3e1ec343b2c3089faa35da0e0fa420' 
  AND token = '2cjXZCjWl6H9OH+3gUXRpT4LKaYq2vvN7yI8VZWgUf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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