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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca5680a92dec51c36389daa8190696b56f7ec9764a009a9948ab77fc78f65d4' 
  AND token = '1y1K12P1HqJz352oTvhTvkD08az8mfFUoJITKBEeZks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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