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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68f1b61d798983c0ac9e47e15db92d79e384d43c6ef6ffd7ae448c194a42f13' 
  AND token = 'VPiRImLZpE+TMffruUWkV32HPnutvuFIOwe+BOPaXQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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