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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bac882b6e6f435fb0f62a894a68ca79b8de053d489dcc7e2e76f2d24d9c95a' 
  AND token = 'aMFxMDZulgk8yeANmcsdBi6sWDMdiF/deYsYDJQKhhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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