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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183b9116835f50482751802b270407921c9c2f98082ad85512eb79bf9e5e85e2' 
  AND token = 'FkiBdLMDsjk26JHN8O6c5zu0ihcEotK42hUgwe6Z30s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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