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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431c63d1e00b12207fa06fef7e5e9308d0d7d30f68f0ea8c9da5e1ed2ea990f2' 
  AND token = 'ulcd4bNgCJRih+c75Krqn22arJKBpzllJ6mcSyjaVbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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