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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70dab7677f8e1e642bd27eed66c1b1b7b4de26b4575bae89e8c1c6077b2eec9' 
  AND token = '5dEcndiCxKqbQH2kKsRlhxUGlITo6Tj7ad+ryoaklCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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