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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad5e3fdb0752cd06408298d17a41c163a9a6d4855a487db6f943fa00c58c62e' 
  AND token = 'tTImbHlxYWx5p6ehBETCZHIQs/HqahndK/0s6XUs8q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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