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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbb57a5a029d4f91801bb5d0422248cbd6fc4d43ff2a4147a6bec3c60e42d57' 
  AND token = '1rOrvdNn14DuP6WGFkNv64F+5tmJxt3I6dq4g/iycFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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