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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ab314364bf7d1193ac0ee838a3e20e647fc1ad30d1ff60c9818f35e5ce890e' 
  AND token = 'BJ53dtEYI/BDeJ25mY9VXENp/I5aLW3PSwb8ibrMp1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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