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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217e832aeccdc7a09494d72c38976aabe174b4a8f04f4aab36da2a5992ea70e9' 
  AND token = 'Hb6n18Dzlb+7+ve4nnKBitHeUzKwh/G6TY4yjRi1kyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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