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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1a9e3cb77fece2bfabd00b23751aff6ad0d9a7828dd311e7ec35bf849fb5ec' 
  AND token = '3m9kJsgE30U2OpW6ZMX9qIpDqaj3PWmErtumyFM425c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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