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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84c1398d36ad947a4a080226c744bee4a98e6b5efdd23b7bbe83bba1ca7316e' 
  AND token = 'GMAW3amTOrpKu/U8Mh0zJdQzOZhMdu1xl8oxDn6aSi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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