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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe9b04a6410382dc01216d89bbec503bdeaf07f0c3f3ddaf96a4a0b9bbb42d5' 
  AND token = 'nlDTOcFyGrCF1uhH/KT4nXgPsWrJ0CGoGuK0zeVL8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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