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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2f86d40c9677b08fab7bfe853e666e773bd2f3c8222e8848f0c6eaf5e33e22' 
  AND token = 'ZuiTbTwck+KCac9PbGXB6Yvjus6bz/RdWjur6d6Grmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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