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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e30a0fcce9da0a5d2a1ad6009ec07fc6ce0c5f82663cc58b385d441e026239' 
  AND token = '9dRQUvJBS84qSgfKE7v/7i5LY3Elykf/z4JNf5Sgdac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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