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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c9567b87bdb58b2ab377e7fced812462fa0217978a84abef0509d50a6fe98c' 
  AND token = 'Phax5tasbqHUETVj7P+tyzaTTpwSyg9AbDFx+Ea63h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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