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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cf18c5f534b137803834a9ab8acdfa5e925f570174f85eb8b3262be90bb00d' 
  AND token = '/ZArype1TzBegCtqGi7AnIC1/r1cDjusUHrKZqAkaMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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