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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c49e5d454dafcf82b42b94eaf20978086324c33fa16113ffdc1e6886272d40' 
  AND token = 'A2h0Bllw/ofW3S4049tzEAQPRBXAeVifP6K2m1mJ/Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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