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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1fcc7c35688013e2ab1392f89564c46dba6bd4c926235b9cb604baa3f9fe02' 
  AND token = 'qvykETmsHomUPPIP6+mtK58Hs6cM/tMpf7JEGLcW1nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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