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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00043a495724903e5cccf7ec56cd6c79bb159fbb7921b6e13f1122611f1d3518' 
  AND token = 'c9mF4JJf+/cS7QqZfzveN/ahQ+GDmTbH4ra7a+smZnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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