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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a22377571f82268ed2b1d22d1eb50b299eaf912f3ca1ef37534032f401f02d' 
  AND token = '5FGEjD7ti3GaeRoyaQ5HP7oQGSW78mhYPePJb5jX6RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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