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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abcf515209a1b92afde577a67001d176c275d10f4ac916246b4a71543cb4946' 
  AND token = 'WNCLAhI0mDVD8A9HS4OaLdu+S0vqyaMPufk/uRmSJ24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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