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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e097836e8a0b32af2be5e5cea33f2db0dc7874951e42a67d44791c21c27bcb3' 
  AND token = 'Oo9m2wP3wtBlbyRKKGbNV7sRiHTkYnQiqidP8Jwg20w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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