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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652bdd0744b9c60a27c198a755e081e7e22763df4cdd53442d71a7249dbb80ab' 
  AND token = 'x8x145We/GhYuZ7Fi7p4JrUUgCXRW/4cLgnyJHbZhr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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