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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13e3a32949fce98cd0a6da61d606e0f3f1cfffb375a259ed00ec4bc84a96454' 
  AND token = 'lWBrbgI40AJZqBB5lZi3XjLNeo8nZX19nfMPqfnLDmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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