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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8696597d0b5f34ec83be796e790d6eb90a6f7ac60e8c5901922bc3ca0044fcb' 
  AND token = 'LM2q9/i3H4z5e1le1swIknfO5w5mfqdaqA1BYmwve24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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