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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e83087b7e475a341f83ab61c9b407484d9a5bff178de6441b790c4ed9d7201' 
  AND token = 'KTwc888EckOgOcJf1UYaRf/WuNI7u1DGUWbRzUW2g2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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