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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d717a45078cb1dfd6c04295ac666bf446233fde398989beeca1c603592f28c' 
  AND token = 'eODZefYe4fV2I3hrQZrXqD1L9wBE5bHG6d3chL6H+DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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