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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8029ef69e0a3daca4aef6a46caac5780507315c2cde69e3d831378034118e9' 
  AND token = 'SY2CwoYeLKExy7l5nGZ8AbOJ1EAD/R7fE7OblCvDfhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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