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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa87274e812ac7112758d69882c3ed7a4eeb8e6307e08f1394a7f2f6f8bb7e42' 
  AND token = 'wpZGQ+63AF5Qpuadhr05ymSiJP41raq8LSiejwyLiTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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