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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaf5aa3e60c1051a25e2769ebb3148b28be7b51fffbf9ee95c3cac072cf544e' 
  AND token = 'CwAoPDhmzCpNnM5y46aOzO17Kx3jLll25cbil7bBJLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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