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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e248828884b7d6b6518cddbee54f1df65c037fe397a09e2aebde5950778d05' 
  AND token = 'KQdHLck0zjkBQ2J0iml120Yn/vQLUqybToGalNEZ7o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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