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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0302d811fbfd92cd4a14707c072cb5ff945fb3d4acee835d3db5b8850ca190' 
  AND token = 'aeFIw1uHSjr6PVpuJplM+3TK5d/9inXIdEeOR+uMThE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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