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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441dfdc2c76def4dc88f7e5ffb3c3cffaa01f1f142968de1169e1c51a64c28b2' 
  AND token = 't6WLFtdzw5TX5IHaBD9m10BmAbB3PZWW1MwPlmBNJgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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