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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f800b838b0f4cf40ce36cd8fc37300cdb918a28cd973fa1b1bd0b2c162df61bc' 
  AND token = 'TuzjnFmBEIUFvZ0QWxTSVWECJAoNugwXv7n/sqwsSnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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