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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67600f952b23a2d2d1ffee5fa4789ebd32bd2518455ae5069641b0a2b783700' 
  AND token = 'aUtfRsiPErcl2SyXE0A9vDAuSf+BIK+4BUFYa2bsja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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