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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4b7952cb5660d540942cdd7c4020c79f8070b47bebeb13ea993c88a3851740' 
  AND token = 'NL+Kx0kEC5DebkotjOlcxLjUNof7MUK/MYjswQCgN0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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