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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62884365c13a25a770b2582f85b6f1f21ad1841ae7700ad3d42aa01341750490' 
  AND token = 'YFNCzlUBBA2Ilny/uDLLGekk3boMkFMtfla92+CBqpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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