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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c387cd4b38beba87645d7d30aec2052f5e3596c5febab4fdeae13e5d9f5987f5' 
  AND token = 'Hou/AVU6iPFFpjy9nT40H/SyB1TEXI9m7fr/xiIZYYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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