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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987ae84eb8af01e322a0c9be6769f9ec60504a171c1021d9806a259052503b99' 
  AND token = '65MQvZWIKAZOqJ+/skmsXWja8pwNatnoAVA/H6QHuD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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