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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2da2f1026a786644e3d685109ba4749922b5cec03e134b8185913310c81161' 
  AND token = '9InWTOAKUzf5yeiizQi9JBJdcC1DE1oyebE93SIhbcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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