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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09efc8d1e4e946921da1840caccf10a817e227ebc04b4c3171fa3528450cb9b9' 
  AND token = 'Qns1V61e1929HTQwVgYKTBFh6Nbn8u0Rc9Y6rOHD/jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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