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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a986a73d48460245362a6abf90d4c6c0a476629a26ede658b6e769943934b7' 
  AND token = 'pbUA32KQn0MzpJVtxdK/Y/FBMhJCp7uAQGwlnSCNXTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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