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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8c286e9ef29e6a4b25f79024aba73fb0ba21df9a52b4fdf6806b15fc8a6b07' 
  AND token = 'HCApnhfiCGgFipaZMFi2cA18QfVWtb0FZb+REG8pQpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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