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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a95cf1e8f9d53de10a48462dd6c7b9430a773d6fd42855dc9d45e0168ddd31' 
  AND token = 'Zx25zaAZ8a1NheWk6/adn2N/xa4djxInUJarJqyg0kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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