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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04c40c6ca2d4e54be1c5ff60b8d4e43d2471bd593cdf16dbf384e08501f0b5d' 
  AND token = 'e0o9OfsEU7sXkjTD2RpnUVZUpRcsVXeXWlCJMiT8Gsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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